feat(editor): render empty fragment if toolbar and editable are null

The editor now renders an empty fragment instead of nothing when both the toolbar and editable props are null. This ensures that the editor always renders something, even if it's just an empty fragment.

packages/editor/src/Editor.tsx

@@ -76,6 +76,7 @@ const Editor = ({
           toolbar,
           OfromNullable,
           Omap((tb) => <Grid item>{tb}</Grid>),
+          OgetOrElse(() => <></>)
         )}
         {pipe(
           editable,